docs: Add supported versions and fix-backport policy

[lttng-tools.git] / src / bin / lttng-sessiond / trigger-error-query.cpp

/*
 * Copyright (C) 2021 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#include "event-notifier-error-accounting.hpp"

#include <lttng/action/action-internal.hpp>
#include <lttng/error-query-internal.hpp>
#include <lttng/trigger/trigger-internal.hpp>

enum lttng_trigger_status lttng_trigger_add_error_results(const struct lttng_trigger *trigger
							  __attribute__((unused)),
							  struct lttng_error_query_results *results
							  __attribute__((unused)))
{
	return LTTNG_TRIGGER_STATUS_OK;
}

enum lttng_trigger_status
lttng_trigger_condition_add_error_results(const struct lttng_trigger *trigger,
					  struct lttng_error_query_results *results)
{
	enum lttng_trigger_status status;
	uint64_t discarded_tracer_messages_count;
	enum event_notifier_error_accounting_status error_accounting_status;
	struct lttng_error_query_result *discarded_tracer_messages_counter = nullptr;
	const char *trigger_name;
	uid_t trigger_owner;

	status = lttng_trigger_get_name(trigger, &trigger_name);
	trigger_name = status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(anonymous)";
	status = lttng_trigger_get_owner_uid(trigger, &trigger_owner);
	LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK);

	/*
	 * Only add discarded tracer messages count for applicable conditions.
	 * As of 2.13, only "event rule matches" conditions can generate
	 * reportable errors hence why this function is very specific to this
	 * condition type.
	 */
	if (!lttng_trigger_needs_tracer_notifier(trigger)) {
		status = LTTNG_TRIGGER_STATUS_OK;
		goto end;
	}

	error_accounting_status = event_notifier_error_accounting_get_count(
		trigger, &discarded_tracer_messages_count);
	if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
		ERR("Failed to retrieve tracer discarded messages count for trigger: trigger name = '%s', trigger owner uid = %d",
		    trigger_name,
		    (int) trigger_owner);
		status = LTTNG_TRIGGER_STATUS_ERROR;
		goto end;
	}

	discarded_tracer_messages_counter = lttng_error_query_result_counter_create(
		"discarded tracer messages",
		"Count of messages discarded by the tracer due to a communication error with the session daemon",
		discarded_tracer_messages_count);
	if (!discarded_tracer_messages_counter) {
		status = LTTNG_TRIGGER_STATUS_ERROR;
		goto end;
	}

	if (lttng_error_query_results_add_result(results, discarded_tracer_messages_counter)) {
		status = LTTNG_TRIGGER_STATUS_ERROR;
		goto end;
	}

	/* Ownership transferred to the results. */
	discarded_tracer_messages_counter = nullptr;

	status = LTTNG_TRIGGER_STATUS_OK;
end:
	lttng_error_query_result_destroy(discarded_tracer_messages_counter);
	return status;
}

enum lttng_trigger_status
lttng_trigger_add_action_error_query_results(struct lttng_trigger *trigger,
					     struct lttng_error_query_results *results)
{
	enum lttng_trigger_status status;
	const char *trigger_name;
	uid_t trigger_owner;
	enum lttng_action_status action_status;

	status = lttng_trigger_get_name(trigger, &trigger_name);
	trigger_name = status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(anonymous)";
	status = lttng_trigger_get_owner_uid(trigger, &trigger_owner);
	LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK);

	action_status =
		lttng_action_add_error_query_results(lttng_trigger_get_action(trigger), results);
	switch (action_status) {
	case LTTNG_ACTION_STATUS_OK:
		break;
	default:
		status = LTTNG_TRIGGER_STATUS_ERROR;
		goto end;
	}

	status = LTTNG_TRIGGER_STATUS_OK;
end:
	return status;
}